Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
vach trien » va trien, sach tien, sach tren
trien cong » thien cong
luat khi » suat khi, luat khieu, luat thai
luat thi » luat thai, luan thi, luat thu
cong khi » cong thai, khong khi, co khi
tu sach » thu sach, su sach, te sach
vu vach » vu bach, vu sach, vu khach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach trinh ((luat khi) OR (luat thi)) đong luc ) or ( vu vach trien cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach trinh ((luat khi) OR (luat thi)) đong luc ) OR ( vu vach trien cong khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach trinh ((luat khi) OR (luat thi)) đong luc ) or ( vu vach trien cong khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu sach trinh ((luat khi) OR (luat thi)) đong luc ) or ( vu vach trien cong khi đong luc ))*.